&#7902; &#273;&acirc;y b&#7841;n c&oacute; th&#7875; th&ecirc;m h&#7897;i vi&ecirc;n v&agrave;o danh s&aacute;ch. T&ecirc;n c&#7911;a thu&#7897;c t&iacute;nh c&#7847;n ph&#7843;i ch&#7881; r&otilde; tr&ecirc;n d&ograve;ng &#273;&#7847;u ti&ecirc;n c&#7911;a  file. Nh&#7919;ng thu&#7897;c t&iacute;nh n&agrave;y s&#7869; &#273;&#432;&#7907;c t&#7841;o ra v&#7899;i ki&#7875;u l&agrave; &quot;textline&quot; n&#7871;u ch&#432;a t&#7891;n t&#7841;i.
